流感病毒 z-bo 2020-08-17 468

　　A study by the University of Oxford in England found that the main obstacle to the emergence of highly pathogenic avian influenza viruses is the immunity of birds to their relative strains rather than their ability to acquire the desired mutations. I made it. The highly pathogenic avian influenza virus has caused economic losses to the poultry industry and constitutes a human influenza pandemic threat, but most studies that assess pandemic risk have not found ecological factors. Instead of focusing on the role of viral mutations.

　　Sunetra Gupta and colleagues developed a model to study the evolution of influenza viruses between domestic and wild birds of different life spans. The model uses data from a large number of studies on the prevalence of different influenza viruses in European poultry, focusing on the competition between high-virulence and low-virulence strains. These results indicate that, compared with long-lived species, highly pathogenic strains often appear in short-lived species due to the high turnover rate of the population.

　　In addition, increased contact between species with different life spans can promote the emergence of previously suppressed virulent strains. According to the authors, in agricultural practice, short-lived birds such as domestic ducks are in close contact with long-lived wild birds, which may have led to outbreaks of highly pathogenic strains.